Woodruff School of Mechanical Engineering

Faculty Candidate Seminar

Title:

Synergy of experiments and simulations for an accurate prediction of microstructure evolution in metals: A multiscale approach

Speaker:

Dr. Luis Barrales

Affiliation:

RWTH-Aachen University, Germany

When:

Thursday, January 12, 2017 at 11:00:00 AM

Where:

MRDC Building, Room 4211

Host:

Surya Kalidindi
surya.kalidindi@me.gatech.edu
4043852886

Abstract

Synergy of experiments and simulations for an accurate prediction of microstructure evolution in metals: A multiscale approach A major goal of numerical models and computer simulations in materials science is the prediction of the properties as a function of the previous processing or manufacturing of materials. The processing parameters are, however, not state variables of material properties. It is the spatial arrangement of structural elements such as crystal defects, functional domains and chemical constitution that determines the properties of a material - in other words, the microstructure. Simulations of microstructure development provide the state variables for predictions of macroscopic material behavior. In turn, reliable predictions of microstructure evolution require a good understanding and precise modeling or abstraction of the underlying physical mechanisms for microstructure modification. This can be achieved by atomistic simulation of fundamental physical processes and by bottom-up strategies of data transfer to the mesoscopic and macroscopic scales. In this talk, recent advances in the simulation of microstructure evolution will be presented and discussed. In particular, the combination of experiments and simulations and the utilization of bottom-up approaches will be emphasized. To this aim, diverse examples -ranging from the atomistic simulation of grain boundary migration to the simulation of recrystallization for crash components- will be presented. Additionally, the benefit of utilizing concepts from data-mining and data-analytics in simulations to extract and analyze useful information that was previously ignored will be highlighted.


Biography

Luis A. Barrales-Mora, a native of Mexico City is currently a lecturer at the RWTH-Aachen University and research group leader at the Institute of Physical Metallurgy and Metal Physics. He received with distinction a Bachelor of Engineering in Aeronautics in 2001 and a Master of Science in Metallurgy in 2003 from the National Polytechnic Institute, Mexico. In 2003, he was awarded a grant for doctoral studies from the German Academic Exchange Service. In 2008, he received his Ph.D. in Materials Science from the RWTH-Aachen University. He held a postdoctoral position at the Institute of Physical Metallurgy and Metal Physics until 2010, when he was promoted to lecturer and research group leader and in 2015 he was appointed as interim director of the institute. His research interest includes, among others, the simulation of physical processes of microstructure evolution in metals, and the thermal stability of nanocrystalline materials with a particular emphasis on solid-solid interphases. He is a co-author of approximately 40 peer-reviewed scientific publications. In addition to Physical Metallurgy, he also regularly teaches several other courses at the graduate and undergraduate level.